Clandestine and On the sly

Clandestine

Clandestine adjective - Undertaken or done so as to escape being observed or known by others.

On the sly and clandestine are semantically related In some cases you can use "On the sly" instead the word "Clandestine" as an adjective or an adverb.

On the sly

On the sly adverb - In a furtive manner.

Clandestine and on the sly are semantically related in secret topic. Sometimes you can use "Clandestine" instead the phrase "On the sly" as an adjective or an adverb, if it concerns topics such as sneaky, underground.
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On the sly and Clandestine. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/clandestine/on_the_sly
Clandestine & On the sly. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/clandestine/on_the_sly>.
On the sly or Clandestine. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/clandestine/on_the_sly.